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JEE Main 2005 (AIEEE) · Doppler Effect

Doppler Effect question from JEE Main 2005 (AIEEE)

Q77JEE Main 2005 · AIEEEEasy

Doppler Effect

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

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Answer: (c)

Observer approaching: $n' = n\frac{v + v_o}{v}$ .
$n' = n\left(1 + \frac{1}{5}\right) = 1.2n$
Increase $= 20\%$ . So the answer is (c) $20\%$ .

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